Doorcheck



Sept. 13, 1932. L. J. LISHNESS 1,876,986

DOORCHEGK Filed Mar oh 12, 1931 2 Sheets-Sheet 1 1 I I i; I

INVENTOR .Lgsander JLfslznEss ATTO RN EYS L. .17 LISHNESS Sept. 13, "1932.

DOORCHECK 2She ets-Sheet Filed March 12, 1931 TTORNE S of door check attached upon a door;

Patented Sept. 13, 1932 LYsANn r g, .1. Lismvnssior tAPEER, MICHIGAN nooiteiancx Applieation filed March 12, 1931. Serial Nd. 521,903.

The present invention pertains to a novel door check and closer of a typepa-rticularly adapted for application to house doors,-ga-

, rage doors, and the like.

The primary object of the present invention'is to devise a mechanism which efii'cient-. ly closes hinged 'doors upon which it i's'applied in a manner preventing undue slamming of the same and whichserv'es further to hold the door in an open position after the latter has been moved on its hinges through an arc Slightly greater thanninety degrees.

I The present invention further contemplates the provision of a pneumatic cushioning device comprising a piston and cylmder so mountedas to prevent rapid movement of the door towards the closed position.

With the above and other ends in view the invention consists in matters hereinafter set forth and'more particularly pointed out in the appended claims; reference being hadto' the accompanying drawings, in which Flgure 1 1s a cross sectional plan of adoor equipped with the present check;

Fig. 2 is an enlarged front elevation of the door check; I

Fig. 3 is an enlarged rear 'elevation of the door check;

Fig. 4 is a transverse cross sectional view taken on the line H ofFig. 2;

Fig. 5 is a transverse cross sectional View taken on the line 55 of Fig. 2; n

Fig. 6 is a top plan view of a modified form thereof;

: Fig. 8 is a frontelevation;

Fig. 9 is a rear elevation; v a I Fig.10 is a'view corresponding to Fig. 9 illustrating the partsin the compressed position which is the position -assumed'when the door is opened;

Fig. 11 is a front elevation of a further modification and Fig. 12 is a longitudinal cross sectional view thereof. n

Like characters of reference are employed Fig. 7 is a longitudinal cross sectional view throughout to designate corresponding parts.

In Fig. 1 the numeral lindicates "a door hinged-to the frame 2. Secured to the frame 2 is a bracket '3 and pivotallysecured' to the. bracket by a pin 4 is a framework comprising a pair of guide bars 5 which are rigidly secured together in spaced relation by cross members 6 and 7. Slidably received between the' guides5 is a similar framework comprising the bars 8 which are joined to-' gether at one end by a cross member 9 and theiropposite ends are held in the proper spaced relation by passing them through the openings 10 in the above described cross mem ber 7. Theouter ends of the members 8 are pivotally secured to a bracket 11 by a pin 12 and the bracket is secured to the door 1.

' In F ig. 4 it will be noted that strips 13 of reinforcing metal are placed alongside the 'cross member 9 and these strips project alongside each of the members 5 to guide the ends of the members 7 and thereby permit the bars 8 to slide longitudinally between the guide bars 5.

When the door l is moved on its hinges from the position shown in full lines in Fig. 1 to the position shown inphantom lines the distance between the pins 4; and 12becomes shorter and therefore the members 5 and 8 are caused to slide longitudinallyrelative to each other. In order thatthese members may be utilized to close the door there'are providedears 13 on the cross members 9 and ears 13 on the cross member 7 and connected to the ears are coiled springs 15. The springs 15 exert pressure tending to pull the cross rods 7 and-9 together and it is apparent that any movement of the members 7 and 9 toward g each other simultaneously increases the dis tance between the pins 4 and 12 and therefore the pressure exerted by the springs in causing such movement automatically closes the door.

In order to prevent the pressure of the springs 15 from closing the door too rapidly there is provided a cylinder 16 which is rigidlysecured to the cross member 7. Within the cylinder 16 is a flexible piston 17, mounted upon a rod 18 that is secured to the,cross member 9. y j

It is obvious that any movementoftherods 5 and 8 causes movement of the cross members 7 and 9 and'movement of the latter causes the piston to move within the cylinder. Air seeps past the sides of the piston quite readily when the piston is moving toward the outer end of the cylinder as is commonly known in air pumps but when the piston is moving in the opposite direction the piston expands by the pressure and the air seepage past the piston is reduced and therefore the piston moves quite slowly. In this manner the movement of the members 5 and 8 occasioned by the springs to close the door 1 is slowed sufliciently to avoid any possibility of slamming.

The pressure of the springs 15 which closes the door is exerted in a straight line between the pins 4 and 12 and when the door is opened to or beyond the position illustrated in phantom lines in Fig. 1 the pressure between these pins holds the door open. The springs resist movement at any stage of movement of the door until it is moved far enough that an imaginary line drawn from center to center of the pins 4 and 12 if continued would pass through the center of the hinge holding the door. After reaching this stage of movement the springs tend to pull the door towards the door frame 2, causing it to engage the bracket 3 and therefore the parts combine to hold the door in its open position.

In Figures 6 to 10 there is illustrated a simplified form of the present invention for use upon doors that are not damaged by slamming and wherein a less expensive form of closer will be sufiicient. In these figures the numeral designates a bracket that is secured to the door frame 21 to which the door 22 is hinged. Pivoted to the bracket 20 by a pin 23 is a channel member 24 having aslot 25. On the door 22 is mounted a bracket 26 to which a channel member 27 is secured by means of a pin 28, an elongated slot 29 being formed in the channel member 27 The channel member 27 rests inside the channel member 24 and its removel is prevented by a pair of screws, one screw 30 be ing mounted in one end of the channel member 24 to project through the slot 29, a shoe 31 being provided to provide a suitable sliding bearing for the nut 32. In the end of the channel member 27 is mounted a screw 33 to project through the slot 25, a shoe 34 being provided to engage the outer surface of the channel member 24. A coiled spring 35 has one end hooked over the screw 30 and its opposite end hooked over the screw 33.

When the door 22 is opened the distance between the pins 23 and 28 becomes shorter and therefore the channel member 27 slides within the channel member 24. This sliding movement causes the screws 30' and 33 to be moved apart as illustrated in Fig. 10 and thereby stretches the spring 35. The normal tendency of the spring 35 is to draw the screws 30 and 33 toward each other and thereby increase the distance between the pins 23 and 28 and increasing this distance can only be accomplished by closing the door. Therefore the door is closed by the pressure of the spring when the former is free from interfering external forces.

The latter described embodiment of the present invention also serve to hold the door in an open position in the same manner as described above in connection with the first embodiment when the door is swung through an are great enough that an imaginary line drawn from the pin 28 through the pin 23 passes the hinge that supports the door.

In Figures 11 and 12 the channel members 24 and 27 are slotted as at 36 to receive a cylinder 37 which is rigidly connectedto the channel member 27. A piston 38 within the cylinder is connected to the screw 33 by a rod 39 and rapid movement of the channel members 24 and 27 relative to each other is prevented by the piston in the cylinder in the same manner as described above.

Although specific embodiments of the present invention have been illustrated and described it is to be understood that various changes may be made within the scope of the appended claims without departing from the spirit of the invention, and such changes are contemplated.

What I claim is:

1. A device of the character described comprising a pair of guide bars, cross rods rigidly securing said guide bars together in parallel spaced relation, sliding bars received between said guide bars, a cross rod securing said sliding bars together in parallel spaced relation, strap members secured to the cross members on each set of bars in a manner to maintain said sliding bars between said guide bars, a cylinder attached to said cross member on said sliding bars, a piston attached to one of the cross members on said guide members andreceived in said cylinder, and springs having one end attached to one of the cross bars on said sliding members and the opposite end attached to one of the cross bars on said guide members.

2. A device of the character described comprising a pair of spaced guide members, a

cross rod securing said guide members together spaced sliding members slidably mounted between said guide members and extending inwardly through openings in said cross rod, a cross bar secured to the inn-erends of said sliding members and maintaining the same in spaced relation, a cylinder attached to the cross rod on said guide members, a piston attached to the cross bar on said sliding members and received in said cylinder and coil springs having one endattached to each of said cross rods.

3. A device of the character described comprising a pair of guide bars, strap members secured to the sides thereof and securing the same in parallel spaced relation, sliding members received between said guide members and between said strap members, strap members securing said sliding members in parallel spaced relation and projecting beyond said sliding members to engage said guide members, a cylinder connected to the strap members on said guide members, a piston connected to the strap members on said sliding members, and coiled springs having an end connected to each of said strap members.

In testimon whereof I afiix my si nature.

L SANDER J. LISH ESS. 

